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Java SDK for Milvus, a distributed high-performance vector database.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package io.milvus.param.dml;
import com.google.common.collect.Lists;
import io.milvus.common.clientenum.ConsistencyLevelEnum;
import io.milvus.exception.ParamException;
import io.milvus.param.Constant;
import io.milvus.param.ParamUtils;
import lombok.Getter;
import lombok.NonNull;
import lombok.ToString;
import java.util.ArrayList;
import java.util.List;
/**
* Parameters for query interface.
*/
@Getter
@ToString
public class QueryParam {
private final String databaseName;
private final String collectionName;
private final List partitionNames;
private final List outFields;
private final String expr;
private final long travelTimestamp;
private final long guaranteeTimestamp;
private final long gracefulTime;
private final ConsistencyLevelEnum consistencyLevel;
private final long offset;
private final long limit;
private final boolean ignoreGrowing;
private final boolean reduceStopForBest;
private final boolean iterator;
private QueryParam(@NonNull Builder builder) {
this.databaseName = builder.databaseName;
this.collectionName = builder.collectionName;
this.partitionNames = builder.partitionNames;
this.outFields = builder.outFields;
this.expr = builder.expr;
this.travelTimestamp = builder.travelTimestamp;
this.guaranteeTimestamp = builder.guaranteeTimestamp;
this.consistencyLevel = builder.consistencyLevel;
this.gracefulTime = builder.gracefulTime;
this.offset = builder.offset;
this.limit = builder.limit;
this.ignoreGrowing = builder.ignoreGrowing;
this.reduceStopForBest = builder.reduceStopForBest;
this.iterator = builder.iterator;
}
public static Builder newBuilder() {
return new Builder();
}
/**
* Builder for {@link QueryParam} class.
*/
public static class Builder {
private String databaseName;
private String collectionName;
private final List partitionNames = Lists.newArrayList();
private final List outFields = new ArrayList<>();
private String expr = "";
private Long travelTimestamp = 0L; // deprecated
private Long gracefulTime = 5000L; // deprecated
private Long guaranteeTimestamp = Constant.GUARANTEE_EVENTUALLY_TS; // deprecated
private ConsistencyLevelEnum consistencyLevel = null;
private Long offset = 0L;
private Long limit = 0L;
private Boolean ignoreGrowing = Boolean.FALSE;
private Boolean reduceStopForBest = Boolean.FALSE;
private Boolean iterator = Boolean.FALSE;
private Builder() {
}
/**
* Sets the database name. database name can be nil.
*
* @param databaseName database name
* @return Builder
*/
public Builder withDatabaseName(String databaseName) {
this.databaseName = databaseName;
return this;
}
/**
* Sets the collection name. Collection name cannot be empty or null.
*
* @param collectionName collection name
* @return Builder
*/
public Builder withCollectionName(@NonNull String collectionName) {
this.collectionName = collectionName;
return this;
}
/**
* ConsistencyLevel of consistency level.
*
* @param consistencyLevel consistency level
* @return Builder
*/
public Builder withConsistencyLevel(ConsistencyLevelEnum consistencyLevel) {
this.consistencyLevel = consistencyLevel;
return this;
}
/**
* Sets partition names list to specify query scope (Optional).
*
* @param partitionNames partition names list
* @return Builder
*/
public Builder withPartitionNames(@NonNull List partitionNames) {
partitionNames.forEach(this::addPartitionName);
return this;
}
/**
* Adds a partition to specify query scope (Optional).
*
* @param partitionName partition name
* @return Builder
*/
public Builder addPartitionName(@NonNull String partitionName) {
if (!this.partitionNames.contains(partitionName)) {
this.partitionNames.add(partitionName);
}
return this;
}
/**
* Specifies output fields (Optional).
*
* @param outFields output fields
* @return Builder
*/
public Builder withOutFields(@NonNull List outFields) {
outFields.forEach(this::addOutField);
return this;
}
/**
* Specifies an output field (Optional).
*
* @param fieldName field name
* @return Builder
*/
public Builder addOutField(@NonNull String fieldName) {
if (!this.outFields.contains(fieldName)) {
this.outFields.add(fieldName);
}
return this;
}
/**
* Sets the expression to query entities.
* @see Boolean Expression Rules
*
* @param expr filtering expression
* @return Builder
*/
public Builder withExpr(@NonNull String expr) {
this.expr = expr;
return this;
}
/**
* Specify a position to return results. Only take effect when the 'limit' value is specified.
* Default value is 0, start from begin.
*
* @param offset a value to define the position
* @return Builder
*/
public Builder withOffset(@NonNull Long offset) {
this.offset = offset;
return this;
}
/**
* Specify a value to control the returned number of entities. Must be a positive value.
* Default value is 0, will return without limit.
*
* @param limit a value to define the limit of returned entities
* @return Builder
*/
public Builder withLimit(@NonNull Long limit) {
this.limit = limit;
return this;
}
/**
* Ignore the growing segments to get best query performance. Default is False.
* For the user case that don't require data visibility.
*
* @param ignoreGrowing Boolean.TRUE ignore, Boolean.FALSE is not
* @return Builder
*/
public Builder withIgnoreGrowing(@NonNull Boolean ignoreGrowing) {
this.ignoreGrowing = ignoreGrowing;
return this;
}
/**
* Adjust the query using iterators to handle offsets more efficiently during the Reduce step. Default is False.
*
* @param reduceStopForBest Boolean.TRUE ignore, Boolean.FALSE is not
* @return Builder
*/
public Builder withReduceStopForBest(@NonNull Boolean reduceStopForBest) {
this.reduceStopForBest = reduceStopForBest;
return this;
}
/**
* Optimizing specifically for iterators can yield correct data results. Default is False.
*
* @param iterator Boolean.TRUE ignore, Boolean.FALSE is not
* @return Builder
*/
public Builder withIterator(@NonNull Boolean iterator) {
this.iterator = iterator;
return this;
}
/**
* Verifies parameters and creates a new {@link QueryParam} instance.
*
* @return {@link QueryParam}
*/
public QueryParam build() throws ParamException {
ParamUtils.CheckNullEmptyString(collectionName, "Collection name");
ParamUtils.CheckNullString(expr, "Expression");
if (travelTimestamp < 0) {
throw new ParamException("The travel timestamp must be greater than 0");
}
if (guaranteeTimestamp < 0) {
throw new ParamException("The guarantee timestamp must be greater than 0");
}
if (offset < 0) {
throw new ParamException("The offset value cannot be less than 0");
}
if (limit < 0) {
throw new ParamException("The limit value cannot be less than 0");
}
return new QueryParam(this);
}
}
}